表面活性剂提高致密油藏渗吸采收率研究

发布时间：2018-02-28 10:29

本文关键词： 表面活性剂致密油藏润湿性界面张力渗吸机理　出处：《油田化学》2016年04期 　论文类型：期刊论文

【摘要】：为了明确表面活性剂改变岩石润湿性及降低界面张力的特性对致密油藏渗吸采油的作用效果,获得表面活性剂渗吸采油的有利条件,通过测量岩心接触角和表面活性剂溶液与油间的界面张力,研究了3种常用表面活性剂重烷基苯石油磺酸盐(ZPS)、十二烷基苯磺酸盐(SDBS)和磺基甜菜碱(SB)对致密岩心渗吸采收率的影响,分析了自发渗吸机理。结果表明,阴离子表面活性剂改变岩心润湿性的能力好于非离子表面活性剂,两种阴离子表面活性剂(ZPS、SDBS)将岩心表面由油湿反转为水湿,非离子表面活性剂(SB)降低了岩心表面接触角,但未达到润湿反转的效果;油湿岩心介质在注入水溶液中不发生渗吸,表面活性剂引起的接触角改变可实现油湿岩心渗吸采油;岩心原始润湿性影响渗吸采收率,渗吸采收率增幅从大到小依次为水湿岩心中性岩心油湿岩心;三种表面活性剂均可使界面张力降至最佳渗吸界面张力范围10-1～10-2m N/m,油水界面张力的降低有利于提高岩心自发渗吸采收率。
[Abstract]:In order to determine the effect of surfactant on permeability and oil recovery in dense reservoir by changing the wettability of rock and reducing the interfacial tension, the favorable conditions of surfactant imbibition and oil recovery are obtained. By measuring the contact angle of the core and the interfacial tension between the surfactant solution and the oil, The effects of three kinds of surfactants, heavy alkylbenzene petroleum sulfonate, 12 alkylbenzene sulfonate SDBs and sulfonbetaine SBs, on the permeability recovery of dense core were studied. The mechanism of spontaneous permeation was analyzed. The ability of anionic surfactants to change the wettability of cores is better than that of Nonionic surfactants. Two anionic surfactants (ZPS SDBS) reverse the core surface from oil to water, and Nonionic surfactants (SBs) reduce the contact angle of core surface. However, the effect of wetting inversion is not achieved; the oil wet core medium does not permeate and absorb in the injected aqueous solution, the change of contact angle caused by surfactant can realize the oil absorption and oil recovery from the oil wet core, and the original wettability of the core affects the permeability recovery, The increase of permeability and oil recovery factor is from large to small in order of water wet core neutral core oil wet core; The three surfactants can reduce the interfacial tension to the optimum range of 10 ~ (-1) ~ (-2) N ~ (-1) N ~ (-1) N ~ (-1) N / m, and the decrease of oil-water interfacial tension is helpful to improve the spontaneous permeability recovery of core.
【作者单位】：提高油气采收率教育部重点实验室(东北石油大学);中国石油勘探开发研究院廊坊分院;
【基金】：“十三五”国家科技重大专项“储层改造新工艺;新技术”(项目编号2016ZX05023005) 中国石油股份有限公司课题“体积改造设计、实施及评估技术研究与应用”
【分类号】：TE357

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